import org.apache.log4j.Logger;
public class Log4jDemo {
    public static void main(String[] args) {
        Logger logger = Logger.getLogger(Log4jDemo.class);
        logger.error(">>>> hello");
        logger.trace(">>>> hello");
        logger.warn(">>>> hello");
        logger.info(">>>> hello");
        logger.debug(">>>> hello");


    }
}
